diff --git a/core/src/main/java/hudson/cli/QuietDownCommand.java b/core/src/main/java/hudson/cli/QuietDownCommand.java
index c4cd7e02a9..9ef404068e 100644
--- a/core/src/main/java/hudson/cli/QuietDownCommand.java
+++ b/core/src/main/java/hudson/cli/QuietDownCommand.java
@@ -40,7 +40,7 @@ public class QuietDownCommand extends CLICommand {
 
     private static final Logger LOGGER = Logger.getLogger(QuietDownCommand.class.getName());
 
-    @Option(name = "-block", usage = "Block until the system really quiets down and no builds are running")
+    @Option(name = "-block", usage = "Block until the system really quiets down and no builds are running. Note that running Pipeline jobs do not block the quiet down: they pause at the end of their current step")
     public boolean block = false;
 
     @Option(name = "-timeout", usage = "If non-zero, only block up to the specified number of milliseconds")